1991 toyota camry automatic. Transmission is fine

The shift control solenoids for this model of toyota is internal. it is located on the valve body on the bottom of the transmission. Accessed only by removing the fluid pan. You should take the vehicle to and authorized service provider to be checked and repaired!

It is quite likely to be a failed shift solenoid, causing inability to find low gears. There should be a trouble code stored, causing the O/D lamp to blink.

Get a readout from the car's computer to see if there is a trouble code stored, which will give a good clue to the problem.

Camrys of this age often have a shift solenoid fail in the transmission, which will cause the symptoms you describe,

Is your O/D light blinking to notify a trouble code? If so, it could be a failed shift solenoid.

If not, the first place to look would be low trans fluid level.

it has a inter damage, and you have to visit a repair transmision shop, sorry...

2000 toyota camry gear shift lever will not engage automatic transmission. it feels as though it is disconnected

Possible fault is within the gear box. it could be that the rpm governor is not reacting accordingly, have you changed the transmission oil? if not replace with the original grade.Also check if the brakes arre jammed by lifting up each wheel and checking for free movement. please respond if this will solve your issue.

is your transmission manual or automatic

you are experiencing early to mid stage transmission failure.

the overdrive button on your automatic transmission is for cruising on the highway basically like having another gear for better economy careful not to use it when your not on the highway because lugging the car in overdrive when its not needed will cause higher fuel consumption other than that you should have no problems just get out on the highway and push and away you go